Every serious SEO/SEM Campaign starts with Keyword Research. What ever you do after the Keyword Research will rely heavily on the Quality of your Research. It is the bread and butter of todays Search Engine Marketing.

This Tool helps to "mash up" the results of various individual Keyword Research Tools to help you to get usable results faster. You might also want to have a look at the Keyword Suggestion Tool by Digital Point below.
Don't forget to get your copy of the Free Keyword Research Guide (see further down below).

How does the Keyword Suggestion Tool work?
The SEO Book Keyword Suggestion Tool is driven off the Overture keyword suggestion tool and offers suggested monthly regional search volumes by market for Google, Yahoo!, and MSN (traffic figures used for Google, Yahoo! and MSN are estimates).

This Keyword Suggestion Tool also provides links the search volumes to the related global search results and links to price estimate tools from Overture and Google AdWords. That Google AdWords tool shows the necessary bid to rank #1 for 85% of queries, and roughly how much traffic you could expect AdWords to send you based on that bid price.

Also available are links to Google Trends, Google Suggest, Google Synonyms, Yahoo! Suggest, Nichebot and Wordtracker keyword research results.

Last but not least does the Keyword Suggestion Tool provide links to various vertical databases like Topix.net, Google Blogsearch, and Del.icio.us to let you know if people are talking about your topic and what types of resources they are referencing.